4ohm speakers to 2 ohms

The answers looked pretty clear to me....you can't bridge 2 ohm load onto this amp.  When a two channel amp is 2 ohm stable, the meaning is that each of the two channels can be 2 ohms.  Bridging connects the two channels, and connect means to parallel, which puts half the load onto each channel.  So the amp would have to be 1 ohm stable to bridge a 2 ohm load onto it.  To use this amp for subs and get the most output, trade out your current subs for models that will combine to create a total 4 ohm impedance....such as two DVC 4 ohm subs.

Or get a different type of amp.  A class D mono amp is one channel, and you can combine the two subs you have and use that type.